已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值
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已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值
解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6
化简求值:
1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)
已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6
化简求值:
1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)
已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
已知x:y:z=2:3:5,求x+y+z/x-2y+3z的值
设x=2k y=3k,z=5k (k≠0)
( x+y+z)/(x-2y+3z)=(2k+3k+5k)/(2k-2×3k+3×5k)
=10k/11k=10/11
解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6
解 -1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
(2x+9)/(x+2)(x+7)=(2x+9)/(x+3)(x+6)
(2x+9)[1/(x+2)(x+7)-1/(x+3)(x+6)]=0 分母不能等于0
x=9/2
化简求值:
1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)
(1+x)/(x+1)(x-1)÷?
已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
设x=2k y=3k,z=5k (k≠0)
( x+y+z)/(x-2y+3z)=(2k+3k+5k)/(2k-2×3k+3×5k)
=10k/11k=10/11
解方程:x+1/x+2-1/x+7=x+2/x+3-1/x+6
解 -1/(x+2)-1/(x+7)=-1/(x+3)-1/(x+6)
1/(x+2)+1/(x+7)=1/(x+3)+1/(x+6)
(2x+9)/(x+2)(x+7)=(2x+9)/(x+3)(x+6)
(2x+9)[1/(x+2)(x+7)-1/(x+3)(x+6)]=0 分母不能等于0
x=9/2
化简求值:
1+x/x^2-1除以(x-2+3/x+2)*(x^2-2x+1)(其中x=1/2)
(1+x)/(x+1)(x-1)÷?
已知3(x^2-1)^-1=x+1/2*(x^2-1)^-2,求X的值
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